ad (S) Properly, As much as; as--so; as (done or said) so returned; or as required so rendered, tantum quantum; but, popularly, at the farthest or at the most.
ad (S) Properly, As much as; as--so; as (done or said) so returned; or as required so rendered, tantum quantum; but, popularly, at the farthest or at the most.